Velocity (Vs) Display (1-D Profile)
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1 PS User Guide Series 2015 Velocity (Vs) Display (1-D Profile) Prepared By Choon B. Park, Ph.D. January 2015
2 Table of Contents Page 1. Overview 2 2. Files 6 3. View 7 4. Edit 9 5. Chart Layer Dispersion Inversion Seismic 23 1
3 1. Overview This module is specifically for the 1-D layered-earth model (*.LYR) that is obtained from the inversion of one measured dispersion curve (*.DC). In addition to display, this module can perform editing of the model such as changing velocities and depths of layers and remapping current layer model into different depth model, etc. It can also apply certain processes such as calculating average shear-wave velocity (Vs) for a certain depth (or layer) range (e.g., Vs30m), combining with other models, generating an average model from multiple models, exporting current 1-D (depth) velocity (Vs) structure into an existing 2-D Vs file, etc. Furthermore, those forward modeling schemes are also included that can generate theoretical dispersion curves, seismic records, and dispersion images by using the current model displayed as input. To display a layered-earth file (*.LYR), in the main menu go to "Display" "S-Velocity (Vs) Data" "1-D Vs Profile (*.LYR)" and then select such a file as illustrated below. The program will ask if the linked (measured and modeled) dispersion curves are also to be displayed. The information about them is encoded in the input LYR file. If it is chosen by clicking "Yes" as shown below, then a message box will appear that instructs how to manually edit the input layered-earth model. This means the "real-time manual inversion" is enabled as shown below. 2
4 The display below shows the shear-wave velocity (Vs) profile of the input LYR file among other additional parameters included in the file [i.e., Vp, Poissons' ratio ( ), density ( ), and Q values (Qs and Qp)]. The two dispersion curves are also displayed with one of the two vertical axes converted to a frequency (Hz) axis. The match between the two is indicated on top of the form [e.g., "Dispersion Curve Match (%): 87.69"]. As velocities are manually changed by using the mouse, the corresponding modeled dispersion curve will be updated and the new match will be displayed on top so that the manual inversion can be "steered" in the most favorable direction. In addition, an automatic inversion can be launched at any stage in the sequence of manual inversion that will use the current model as the initial model to search for a "better" model that gives an improved match in dispersion curves. This is further explained in section 8 ("Inversion"). In the vertical tool panel displayed on the right side of the form are arranged those buttons that can display layer parameters such as depth ("Z"), shear-wave velocity ("Vs"), P-wave velocity ("Vp"), Poisson's ratio (" "), density (" "), and Q-values ("Qs" and "Qp"). The "Vs/Vp" button, if depressed, will ensure the ratio between the two velocities (Vs and Vp) remains unchanged when either of the two is manually changed. Otherwise, the Poisson's ratio ( ) will be updated in response to the change of either velocity (Vs or Vp). The "Vs30m" button will evaluate the seismic site classification code based on the designation by National Earthquake Hazard Reduction Program (NEHRP) and the International Building Code (IBC) and display the result inside the chart. Examples of all these cases are illustrated below. 3
5 Velocities (Vs and Vp) are displayed on the left, and Poisson's ratio ( ) is displayed on the right. Density ( ) (on the left) and Q values (Qs and Qp) (on the right) are displayed below. The "Vs30m" is calculated and seismic site class ('C') has been assigned in the chart below. 4
6 The top tool panel contains eight (8) tabs: "Files", "View", "Edit", "Chart", "Layer", "Dispersion", "Inversion", and "Seismic." The type of task performed by each tab is explained below. Files View Edit Chart Layer Dispersion Inversion Seismic Another file can be opened to replace the current file or to be added into the current display. The current layered-earth model can be saved into another file (*.LYR) or its image can be saved as a graphic file (*.BMP; *.JPG). The current chart image can be printed, or its contents (i.e., numbers and text) can be printed. Dispersion curve(s) can also be imported as a comparison with modeled dispersion curve. Chart graphic related parameters can be changed such as axis scales, grid lines, etc. Contents of the current file (*.LYR) can be viewed in a separate window. The seismic site classification table (*.PDF) can also be displayed. The current model can be changed manually by using the mouse or typing values in the appropriate boxes displayed in a tabular form. A new layer model can be created. All chart controls are included that can control display attributes of layer parameters. Layer-related operations can be performed such as stretching the depth scale, calculating average velocity (Vs or Vp) for a specified range, generating an average layer model (*.LYR) from multiple models, summing (or subtracting) two models, remapping into another "reference" depth model, etc. Theoretical dispersion curves of any mode (e.g., fundamental, 1st higher, 2nd higher, etc.) can be generated via forward modeling by using current velocity (Vs and Vp) and density ( ) model as input. Detailed explanations about this modeling are provided in the PS User Guide "Modeling Dispersion Curves." Automatic inversion can be performed that uses the current velocity (Vs) model as the initial model. Complete inversion parameters can be controlled that are fully explained in the PS User Guide "Inversion." A seismic record and the corresponding dispersion image can be generated from the current model that includes velocities (Vs and Vp), density ( ), and Q values (Qs and Qp). Details about this modeling is provided in the PS User Guide "Modeling Seismic Data." 5
7 2. Files Open Opens a different layered-earth file (*.LYR) to replace the current one. New Opens another layered-earth file (*.LYR) to display in the same chart. Save Saves the current layered-earth file as a separate file (*.LYR). *.bmp Saves the current chart image as a graphic file (*.BMP, *.JPG). Print ( ) Prints the current chart image. Print ( ) Prints contents (i.e., numbers and texts) of the current layered-earth file (*.LYR). Open DC Opens and displays a dispersion curve file (*.DC). 6
8 3. View Grids Displays dotted horizontal and vertical grid lines on the chart. X* Increases (right click = decreases) horizontal axis scale. Y* Increases (right click = decreases) vertical axis scale. Data Displays data values of a layered-earth file for a complete set of variables as shown below. Contents History Bounds Shows complete contents (i.e., data values and processing history) of the file. Shows only the processing history portion of the file. Displays (as illustrated below) numerical limits (lower and upper bounds) of each layer's velocity (Vs) that fall under 99% confidence of inversion. This evaluation is based on the numerical sensitivity of the Jacobian matrix used during the inversion process. 7
9 DC's If the displayed file (*.LYR) is an inversion output, then the corresponding dispersion curves (i.e., "measured" and "modeled" curves) can be displayed, if chosen (i.e., "Yes" below). Delete Vs30m Dispersion curves currently displayed (except for the "modeled" curve) will be deleted. Displays the seismic site classification table (*.PDF) adopted by National Earthquake Hazard Reduction Program (NEHRP) and the International Building Code (IBC) as shown below. 8
10 4. Edit Edit LYR ( ) Depress the Edit LYR button to enable editing of the model displayed in the chart. A message box (shown below) will appear to instruct how to do it. To change the value of any layer, click and drag the layer's bar (vertical) line horizontally (left and right). To change the depth of any layer, click and drag the (top or bottom) boundary (horizontal) line vertically (up and down). For this, the depth ('Z') button in the tool panel on the right side must be depressed. Instead of using the mouse, values can be typed in when the "Show" button is depressed as explained next. [Why italics?] Show If this button is depressed, a separate panel will appear on the top of the chart (shown below) where edit boxes are arranged. Value of individual variables (e.g., Vs, Vp, etc.) in the displayed model (*.LYR) can be changed by typing in the appropriate box. Display of the model will be accordingly updated as values are changed. Edit LYR ( ) Click the button for a separate display where numerical values of all layer variables are displayed in a table (shown below). Individual items can be changed by manually typing. 9
11 New LYR Click this button to replace the current layered-earth model (displayed in the chart) with a new model with initial values that can be specified in the dialog as shown below. Remap The current layered-earth model can be remapped according to a new depth model, which is defined by another ("reference") model. The following message will appear and then a file for the new depth model will have to be imported as shown below. The current layered-earth model will be accordingly updated on the display. Unit Click this button to change the distance unit of the model. Two options are available; (1) simple change of labeling and (2) converting values of related data into those of the other unit. The dialog shown below illustrates the two options. 10
12 5. Chart Show All Displays the following control dialog that contains all the chart-related controls. A full description of common chart controls is provided in the PS User Guide Chart Controls." The "Curve To Apply" box at the bottom of the dialog below is unique to this module of 1-D Vs display. Click an appropriate item in the box to select the corresponding variable in the model to apply the changes. Data Axis Label Panel Displays the dialog above with the "Data" tab opened. Displays the dialog above with the "Axis" tab opened. Displays the dialog above with the "Labeling" tab opened. Displays the dialog above with the "Panel" tab opened. 11
13 6. Layer Scale* Depth scale of current layer model can be enlarged (normal click) or reduced (right click) by a preset amount (10 %) each time the button is clicked. The example below shows how the original layer model (left) is enlarged in depth scale after a few normal clicks (right). Vave Average velocity (Vs or Vp) can be calculated for a specified range of depth or Layers. A control dialog will appear as shown below where the type of velocity ["S-Velocity (Vs)" or "P-Velocity (Vp)"] can be selected. Type of average can also be selected in the "Average type" box where either "Depth" (left) or "Layers" (right) can be selected. If the former is selected, then the maximum depth is specified in the "Maximum depth (Zmax)" box. If the latter ("Layers") is selected, then a separate box will appear where the layer range is specified in the "Start No." and "End No." boxes. If the last layer ("Half Space") is included in the range, then its depth ratio (used during the calculation of relative contribution) is specified in the "Half-Space (HS) Ratio*" box. Click "OK" button to show the calculated average velocity. The two examples shown below illustrate the output values in the above two cases of average type. 12
14 Average This will produce an average model (*.LYR) from multiple models (*.LYR's) to be imported. The existing model(s) currently displayed will not be automatically included in the average process. On clicking the button, this information will be displayed in the message box shown below ("INFO" box). Then, a multiple number of LYR files will have to be imported that may have different depth models (i.e., different number of layers and different maximum depths) as shown below ("Open" dialog). Then, another message box (2nd "INFO" box) will indicate a "reference" file will have to be imported that will be used as the depth model for the output file (*.LYR) (2nd "Open" dialog). Then, the last message box (last "INFO" box) will instruct how to specify the output file name (*.LYR) ("Save As" dialog). Then, the output will be displayed in the current form by replacing the previous model as shown below. 13
15 Bounds Theoretical limits of velocity for each layer (i.e., lower and upper bounds) can be calculated based on each layer's sensitivity on the "reference" dispersion curve. Then, calculated bounds can be used as relative confidence levels if the model (*.LYR) is an inversion output from a measured dispersion curve (*.DC). In this case the velocity range between the two limits may indicate such a range within which the "true" solution can exist with a certain probability, for example, of 99%. In this sense, the bounds of each layer can represent relative confidence levels. On the other hand, if the current model is not an output from inversion and there is no measured and modeled dispersions curve linked to it, then a "fictitious" dispersion curve can be modeled within a specified frequency range and then the bounds calculated based on this curve. In this case, the calculated bounds can represent the relative "accuracy" level of each layer that can be evaluated from a possible MASW survey over such a velocity model. If the current model (*.LYR) is an output from the inversion of a measured dispersion curve (*.DC), then the program will calculate the bounds based on the measured dispersion curve specified within the model file (*.LYR). In this case, existing bounds (calculated during the inversion process) will be replaced by the new calculations as informed by a message box shown below (on the left). If there is no dispersion curve linked to current model (*.LYR) (or if the measured dispersion curve is not found), the following dialog (on the right) will appear where the frequency range can be specified to design a "fictitious" curve in the "Start..." and "End..." boxes. The "Bounds limit..." is an arbitrary amount of overall change in dispersion curve to calculate the bounds. "Account for mode jump" and "Use 'Lamb-Wave' approximation" are applied only when the velocity model includes "significant" velocity inversion on top (see PS User Guide "Modeling Dispersion Curves" for more details). Calculated bounds will be displayed in the chart at the end. 14
16 +/- ( ) Two layered-earth model files (LYR's) (one currently displayed and one to be imported) can be added (+) or subtracted (-). When this button is clicked, the following dialog will appear where the operation type ["Subtract (-)" or "Add (+)"] is specified. Then, another dialog will ask if output is to be in percent (%). (The example below shows a choice of "No.") Then, open the other file (*.LYR) and specify output file name (*.LYR). (The example below opens the same file for demonstration purposes.) The output summed file (in red) is displayed below along with the original file (in blue) to illustrate what it looks like. The two files have to have a common (the same) depth model to perform this operation. 15
17 2-D Vs Current 1-D shear-wave velocity (Vs) model can be written as part of the 2-D velocity (Vs) cross section. It can be added to an existing file if the "Append output" box is checked. Check the "Export confidence data if exists" box if the confidence estimation (calculated from bounds of each layer) is also written in the separate file, whose file name has a post fix of "(2DConf).txt" after the output file name specified by clicking the "Output File Name [*(2DVs).txt]" button. Surface (X) location can be specified in the "Output surface (X) coordinate" box where the default value is copied from the input file (*.LYR) if it has such information in it. 16
18 7. Dispersion RUN Generates dispersion curve(s) from the current layered-earth model (*.LYR) displayed in the chart by running forward modeling. On clicking the button, the control dialog (on the left) will appear where parameters of the dispersion curve (e.g., frequency range, frequency interval, number of data points, etc.) can be specified. See PS User Guide "Modeling Dispersion Curves" for detailed explanation about this dialog. Click "OK" and the calculated dispersion curve will be displayed on the chart as illustrated below. It can be noticed one of the two vertical axes is now converted into the frequency (Hz) axis. Edit RUN If this button is depressed, then the dispersion-curve generation will take place in real time as a response to an edit of the layer model by using the mouse (e.g., changing velocity or depth of a layer). The message box below (on the left) informs about this. However, for this to take place, the layer-edit mode has to have been enabled by depressing the "Edit LYR" button in the "Edit" tab of top tool panel. Otherwise, the program will instruct as illustrated below (on the right). The following example illustrates how the 5th layer's velocity (Vs) is changed by using the mouse after depressing the "Edit RUN" button; the calculated dispersion curve is displayed with one of the two vertical axes (right axis) converted into a frequency (Hz) axis. A control dialog for dispersion-curve generation may appear first if not previously displayed. 17
19 Ctrls Displays the control dialog shown below that contains all the parameters related to the forward modeling of dispersion curve(s). See PS User Guide "Modeling Dispersion Curves" for details. Frq Root The control dialog will appear with the "Frequency (Hz)" tab selected where frequency related parameters can be specified as illustrated above. The control dialog will appear with the "Searching option" tab selected where "root searching" parameters (in solving the characteristic equation) can be specified as illustrated below. 18
20 Inverse The control dialog will appear with the "Inverse velocity (Vs)" tab selected where those parameters related to "inverse velocity" structure of input velocity (Vs) model can be specified as illustrated below. 19
21 8. Inversion This inversion tab enables the inversion of a measured dispersion curve through forward modeling. Therefore, the layered-earth model (*.LYR) currently displayed must be an inversion output and the corresponding measured dispersion curve has to be displayed also. The message dialog (below left) indicates the input file is an inversion output file and asks if the measured dispersion curve should be displayed. Click "Yes" to display it and then another message box will appear as shown (below right) that instructs how to change an individual layer s velocity and depth. When the file (*.LYR) is displayed with corresponding (measured and modeled) dispersion curves as shown below, then the match between the two curves is displayed on top of the form [e.g., "Dispersion Curve Match (%): 87.69"] that is the best match found from the previous inversion process. Then, all the buttons (i.e., options) will have been set so that the manual layer edit by mouse is enabled and the corresponding real-time update of modeled dispersion curve is also enabled. Then, the new match will be displayed on top to indicate whether the updated velocity model is a "better solution" or not. The example shown below illustrates this improvement of match that changed from % to % (indicated by red arrow) after the 5th layer's velocity has been changed (indicated by the yellow arrow). 20
22 RUN Clicking this button will launch the "automatic" inversion that uses the current layeredearth model displayed on the chart as the initial model. The process will update the model only when it can find a "better solution" as described above. The example below illustrates a case in which the match further improved from 87.94% to 91.08%. By properly combining the manual inversion described above and this automatic inversion, it is possible to find a velocity model that is most accurate from the numerical perspective and yet more realistic. 21
23 Ctrls Display the following control dialog that contains all the parameters related to the automatic inversion. See PS User Guide "Inversion" for detailed description of these parameters. 22
24 9. Seismic Multichannel seismic record(s) can be modeled using the current 1-D (depth) model (*.LYR) displayed on the chart as an input layered-earth model. This is the modeling by the reflectivity method described in the PS User Guide "Modeling Seismic Data." On clicking the button, the following control dialog will appear that contains all the parameters related to the modeling. See the PS User Guide ("Modeling Seismic Data") for detailed description of these parameters. The following illustrates the modeling output of a seismic record (left) and the corresponding dispersion image (right) calculated from the layered-earth model last displayed. 23
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